From: Lai Jiangshan <laijs@cn.fujitsu.com>
To: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
Ingo Molnar <mingo@elte.hu>, LKML <linux-kernel@vger.kernel.org>
Subject: [PATCH] rcu: remove lock acquirement when very eary boot
Date: Sun, 28 Mar 2010 11:14:13 +0800 [thread overview]
Message-ID: <4BAEC985.6020302@cn.fujitsu.com> (raw)
cleanup: remove lock acquirement when very eary boot
Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
---
diff --git a/kernel/rcutree.c b/kernel/rcutree.c
index 112edb5..e6014e1 100644
--- a/kernel/rcutree.c
+++ b/kernel/rcutree.c
@@ -1646,13 +1646,10 @@ EXPORT_SYMBOL_GPL(rcu_barrier_sched);
static void __init
rcu_boot_init_percpu_data(int cpu, struct rcu_state *rsp)
{
- unsigned long flags;
int i;
struct rcu_data *rdp = rsp->rda[cpu];
- struct rcu_node *rnp = rcu_get_root(rsp);
/* Set up local state, ensuring consistent view of global state. */
- raw_spin_lock_irqsave(&rnp->lock, flags);
rdp->grpmask = 1UL << (cpu - rdp->mynode->grplo);
rdp->nxtlist = NULL;
for (i = 0; i < RCU_NEXT_SIZE; i++)
@@ -1662,7 +1659,6 @@ rcu_boot_init_percpu_data(int cpu, struct rcu_state *rsp)
rdp->dynticks = &per_cpu(rcu_dynticks, cpu);
#endif /* #ifdef CONFIG_NO_HZ */
rdp->cpu = cpu;
- raw_spin_unlock_irqrestore(&rnp->lock, flags);
}
/*
next reply other threads:[~2010-03-28 3:13 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-03-28 3:14 Lai Jiangshan [this message]
2010-03-28 4:17 ` [PATCH] rcu: remove lock acquirement when very eary boot Paul E. McKenney
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